Guest guest Posted September 23, 2008 Report Share Posted September 23, 2008 Dear " lalagin84 " , I am posting two ways of doing this problem, what I will call Strategy A and Strategy B. I will repeat your question again first: on the shelf and find a 473ml bottle FeSO4 220mg/5ml. Approximately > what total volume is to fill this prescription? > a) 50 ml > 70 ml ,,,,,,,,,,,,,,,,,,,,,,, > c) 90 ml > d) 110 ml I believe you are indicating that the correct answer that the book or what you think is correct is 'b. 70 ml'. It is true that 'b' is the correct answer. See below how to solve this problem: Strategy A: Find the total mg and convert to ml Step 1: Find total mg 100mg x 3doses/day x 10 day = 3000mg total Now what is the volume needed to fill the Rx? Or how many ml is 3000mg FeSO4? Step 2: Convert mg to ml Set up ratio/proportion: 220 mg/ 5 ml = 3000mg/Xml Cross multiply: 5 ml x 3000 mg ------------------- = X ml 220 mg Xml = 68.18 ml Strategy B: Another way is solve for 100mg dose (which you have to know for the ml dose for the label anyway) then multiply by 3 then by 10 220 mg/5ml = 100 mg/ X ml Cross multiply: 5 ml x 100 mg ------------------ = 2.27 ml / dose 220 mg 2.27 ml x 3 x 10 = 68.1 ml Comparing results from two different methods: 68.18 ml vs 68.1 ml Recall the rounding done on each problem. The rounding will cause a slight difference in the answers that are derived by two different methods. Round 68.18 or 68.1 ml to the nearest whole number: Answer: B. 70ml Hope this helps you out! Respectfully, Jeanetta Mastron CPhT BS Founder/Owner Above is copyrighted by Jeanetta Mastron on September 23, 2008 (meaning not to be copy and pasted publicly or used on another forum without my written consent) > > can someone pls solve this problem. > You receive a prescription for FeSO4 100mg po TID x 10 days. You look > on the shelf and find a 473ml bottle FeSO4 220mg/5ml. Approximately > what total volume is to fill this prescription? > a) 50 ml > 70 ml ,,,,,,,,,,,,,,,,,,,,,,, > c) 90 ml > d) 110 ml > Quote Link to comment Share on other sites More sharing options...
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